Furnace grate



llg 7, 1951 J. P. BADENHAUSEN l 21,563,388

FURNACE CRATE Filed Jan. 25, 1949 F|G.| f: y 1

FIG. 2

*l ATTORNEY.

Patented Aug. 7, 1951 UNITED STATES PATENT OFFICE John Phillips` Badenhausen, Meadowbrook, Ba.

'Application' January 25, 1949, Serial No. 72,576

6 Claims.

f My invention relatesto furnacefgrates and morefparticularly to `an improved `reciprocatory grate which is adapted for continuous or intermittent movement, as desired. l

Itis the principal object of the present invention to provide a furnaceA grate `with improved provisions for cutting or slicing thelotver portion of the'ash bedlfor the removal of ash and clinkers for discharge.

VIt is a further object of the present invention to provide a furnace grate of the reciprocating type in which the entire grate surface is active and effective, in which adequate provision is made for preventing the cascading of coal through the openings in the grate surface, and :in which adequate provision is `made-for delivery of air through the grate.

It isaffurt-her object of theipresent invention' to provideia furnacegrate capableof operation with a relatively highpressureof` air for the penetration of; the bed supportedthereon.

.'It is a further object of thepresentinvention to provide a furnace grate which is zparticularly suitable for use with produoergas` furnaces in which a relatively thick bed of fuel is employed `and in which combustible rgas is generated forsubsequent-completion of `combustion in` the same furnace. 1

It is a further object of the present .invention to provide a furnace grate of-great strength and in which reciprocatory Vmovement maybe readily effected for ashand clinker removal.

Other objects and advantageous features of the invention will be apparent from thespeciiication and claims.

.Thenature andcharacteristic features of the invention Will .be` more readily understood from the following description, taken in connection withthe accompanying `drawingsforming part hereof, inwhich:

Figure 1 is a fragmentary longitudinal sec tional view `through a furnace having mounted therein a furnace grate inmaccordancewith the present invention, `and takenliapproxirnately.on the line I--i of Fig. 2; and

Fig. 2 is a transverse sectional View taken approximately on the line 2-2 of Fig. 1.

It should, of cou-rse, `beunderstood that the description and drawings 'hereinare illustrative merely, and that various modications and changes may be rnade in the structure disclosed Without departing from the spirit of the invention.

fLike, numerals-refer toxlike partsthroughout the several views.

.2 l *Referring Afnovv more particularly to the draw" ings in which a preferred embodiment of the. invention is illustrated, a furnace `preferably-ofthe producer lgas type is illustrated at |10 and includes pairs of parallel side Walls` i I and# |2 and parallel front and rear walls lrand Mi extending upwardlyv from a floor le. 'A longitudinal central supporting Wall lfextending upwardly from the floorV l5, is `provided for: purposes to `be explained. The side Walls l l -andflIZ may Ibe provided, spaced upwardly from the lower-part thereof, with side Wall headers l'i to which suitable steam generating` tubes i8, lining the upperlportionsof the side Walls Il and |2,` areconnected. The ront Wall i3 may be provided `with a frontzwall header le toivhich steam generating `tubes/ill), extending upwardly in the front wall i3,` maywbe connected. yThe rear wall I4 vinaya'lso"y leerprovided With `steam generating tubesZlI mounted therein andr .if desi-red, fdowncomer tubes-22emay also be provided.

I'Thespecific arrangement of the headers ITI-.and il?, and the. steam Agenerating tubes connected thereto formsv no partof the present invention and a furtherdetailedtdescription is not believed necessary.

The'front `Wall I3 is provided with a recess `or chfirnberZtiv of l,a size to permitof a portion of the grate passing thereinto asZhereinafterex` plained= and the rear wall I4 isprovided Withea similar recess or chamberld for thesame purpose.

The foregoing Afurnace .is adapted to have mounted therein a reciprocating grate which'will nowv be .more particularly described. Spaced upwardly from the bottoni Wall or floor l5, a plurality of horizontal side beams 25 and a central horizontal beam 2S are provided, the beams 25":and 2t beingsecured in positionfor supporting .the furnace grate. 'The centralbeamfZis supported by the-central Wall IE.

lThe furnace grate includeslan upper grate face composed of vtransverse bars, hereinafterymore fully described, and parallel longitudinally :extending supporting beams. The supporting beams preferablycomprise horizontal side beams Zland a central beam 28. 4The side :beams2'l and the central beamat their lower `.portions are provided Withsockets 2e forthe recept-ion ofi-jollers 3i) in rolling engagement with the upper flanges of :the beams25 and 25:1or1permitting longitudinal `Imovement oiithe furnace grate.

.Intermediate the ends of `the `bearnsi'l:` arid12ii, vertically extendingzabutment blocks, 3 lffare: pro videdon the .Webportions of thebeams; Manel-"28 ing movement Vof the grate upon rotation of the shaft 33.

Y 'I'he flange portions of the beams 27 and 28 `preferably have mounted thereon, on the upper faces thereof, a plurality of transversely extending grate Vbar members 4i), 4I and 42. The grate bar members 40, 4l Vand 42 are preferably substantially Z-shaped in vertical cross section and a plurality of different heights of bar members are preferablyremployed. Y As particularly illustrated, bar members 45, 4|, and 42 of three different heights are preferably employed in descending or ascending groups. The Z-shaped Y bars 4G, 4l respectively include lower horizontally disposed clamping flanges or strips 43, 44 and 45 of a Width and arrangement to provide spaced openings 46, 41 and 48 along the flanges of the beams.

The Z-shaped bars preferably also include vertically extending webs 49, 50 and 5l of a height which determines theheight of the respective i preferably provided with a plurality of transversely spaced web plates 55 longitudinally disposed, and with the web plates 55 of the respective bars in alinement. The web plates serve to stiffen the bars and also serve to cut the ash and clinker longitudinally as hereinafter explained. Y

l It will be noted that by the use of bars 40, 4I and 42 of different heights as illustrated, an

4 v to CO with completion of combustion effected above the fuel bed with additional air supplied to the combustible gas released in the fuel bed. The grate is preferably continuously reciprocatedrwith a velocity of travel of the order of two linches perminute for a furnace Width of eight feet and a furnace depth of twelve feet. Upon rotation of the shaft 33, the eccentrics 32 by their engagement with the abutment blocks 3| carried by the beams 21 and 28, actuate the grate. Upon forward movement of thegrate, the upper web plates 55 are effective for cutting V the lower portion of the bed with longitudinal and 42 preferably g ticulate material is prevented by reason of theV uneven supporting surface is provided atV the Y lower part ofthe bed thus facilitating the cutting of the ash and the clinker in the bed upon Vreciprocatory movement of the grate.

At the rear end of the beams 21 and 28, a rear closure bar 55 is provided, preferably comprising an angle with a horizontal leg E'Iandfa vertical leg 58, the legs being connected by lon- 1 gitudinally disposed transversely spaced webs 59 similar to the plates 55. At the front end of the beams 21 and28, a front closure plate 60 is provided, preferably consisting of an angle with unequal legs,` ahorizontally disposed short legV 6I and a vertically disposed long leg 62 being provided. The legs 6I and 52,V have extending Y therebetween, Vat transversely spaced locations,

webs 63 similar to the plates 55.

, gas furnace, that is, a furnace in which the carbonaceous material inthe fuel Vbed is oxidized ings 45, 47 and 48 for discharge into the plenum chamber therebelow.

Air 'supplied to the plenum chamberin any desired manner moves upwardly through the material supported bythe grate for combustion. The rate of movement of the grate, of course, may be varied as desired in accordance with the particular fuel supplied to the furnace, the rate of combustion of the fuel, and the rate of ash production. The undesired escape of fine parlocation of the openings 45, 41 and 48m offset relationship to the anges 52, 53 and 54.

l, in a reciprocatory furnace grate adapted to be interposed between a fire bed and an ash pit, a plurality of parallel supporting beams, fixed supporting members'for said beams, a plurality of bar members secured to and transversely disposed with respect to said beams, said bar members comprising spaced upper strip portions and spaced lower strip portions connected thereto, said'upper strip portions having upper re bed supporting faces and edge portions for'engagementrwith the fire bed for separating portions thereof, the openings between said upper strip portions being offset longitudinally of said beamsy with respect to the openings between said lower strip portions to prevent free downward movement of material from the lire bed to the ash pit,` and members engageable with said beams for reciprocating said beams and the bars secured thereto with respect to said supporting members. Y Y

2. In a reciprocatory furnace grate Vadapted to be interposed between a` re bed andan ash pit, a plurality of parallel supporting beams, fixed supporting members for said beams, a plurality of bar members secured to and transversely disposed with respect to said beams, said bar members comprising upper horizontal transversely extending Vlongitudinally. spaced strip portions and lower horizontal transversely extending lon-V gitudinally spaced strip portions connected to and offset with respect to said upper strip portions, said upper strip `portions having upper fire lower portions to prevent free downwardV move- Y bed supporting faces and edge portions for engagementwith the rire bed for separating portions thereof, the openings between said upper strip portions being offset longitudinally of said beams with respect'to the openings between said "ment of material from the iire bed ito the ash pit, and members engageable with'said beams for reciprocating said beams and the bars secured thereto with respect to said supporting members.

3. In a reciprocatory furnace grate adapted to be interposed between a fire bed and an ash pit, a plurality of parallel supporting beams, ilxed supporting members for said beams, a plurality of bar members secured to and transversely disposed with respect to said beams, said bar members comprising upper longitudinally spaced strip portions respectively disposed at a plurality of different levels and lower longitudinally spaced strip portions connected thereto, said upper strip portions having upper ilre bed supporting faces and edge portions for engagement with the re bed for separating portions thereof, the openings between said upper strip portions being oilset longitudinally of said beams with respect to the openings between said lower portions to prevent free downward movement of material from the fire bed to the ash pit, and members engageable with said beams for reciprocating said beams and the bars secured thereto with respect to said supporting members. y

4. In a reciprocatory furnace grate adapted to be interposed between a nre bed and an ash pit, a plurality of parallel supporting beams, xed supporting members for said beams, a plurality of bar members transversely disposed in engagement with and secured to said beams, said bar members comprising upper horizontal transversely extending longitudinally spaced strip portions respectively disposed at a plurality of diiferent levels, lower horizontal transversely extending longitudinally spaced strip portions, vertically extending portions connecting said upper and lower portions, said upper strip portions having upper nre bed supporting faces and edge portions for engagement with the re bed for separating portions thereof, the openings between said upper strip portions being oset longitudinally of said beams with respect to the openings between said lower portions to prevent free downward movement of material from the fire bed to the ash pit and members engageable with said beams for reciprocating said beams and the bars secured thereto with respect to said supporting members.

5. In a reciprocatory furnace grate adapted to be interposed between a fire bed and an ash pit, a plurality of parallel supporting beams, ilxed supporting members for said beams, a plurality of bar members transversely disposed with respect to said beams and secured thereto,

said bar members comprising spaced upper strip portions and spaced lower strip portions, said upper strip portions having upper re bed supporting faces and edge portions for engagement with the re bed for separating portions thereof, the openings between said upper strip portions being oifset with respect to the openings between said lower portions to prevent free downward movement of material from the fire bed to the ash pit, said bar members having alined vertically disposed longitudinally extending web portions between said strip portionsfor vertical longitudinal cutting of furnace bed material, and members engageable with said beams for reciprocating said beams and the bars secured thereto with respect to said supporting members.

6. In a reciprocatory furnace grate adapted to be interposed between a re bed and an ash pit, a plurality of parallel supporting beams, xed supporting members for said beams, a plurality of bar members transversely disposed with respect to said beams and secured thereto, said bar members comprising upper spaced strip portions and lower spaced strip`portions, said upper strip portions having upper flre bed supporting faces and edge portions for engagement with the re bed for separating portions thereof, the openings between said upper strip portions being oifset with respect to the openings between said lower portions to prevent free downward movement of material from the me bed to the ash pit. roller members interposed between said beams and said supporting members for supporting said beams for longitudinal reciprocatory movement, and members engageable with said beams for reciprocating said beams and said bars.

JOHN PHILLIPS BADENHAUSEN.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 1,140,674 Googins May 25, 1915 1,451,379 Thiele Apr. 10, 1923 1,992,315 Lee Feb. 26, 1935 2,485,379 Hall Oct. 18, 1949 FOREIGN PATENTS Number Country Date 14,283 Sweden Sept. 7, 1901 

